/Engine/Source/Editor/GraphEditor/Public/SNodePanel.h
The widget should respond by populating the OutDrawElements array with FDrawElements that represent it and any of its children. Called by the non-virtual OnPaint to enforce pre/post conditions during OnPaint.
The maximum layer ID attained by this widget or any of its children.
virtual int32 OnPaint &40; const FPaintArgs & Args, const FGeometry & AllottedGeometry, const FSlateRect & MyCullingRect, FSlateWindowElementList & OutDrawElements, int32 LayerId, const FWidgetStyle & InWidgetStyle, bool bParentEnabled &41; const